from Collin de Plancy's Dictionnaire Infernal
Valac seal
In demonology, Valac is the mighty Great President of Jinnestan, having thirty (thirty-eight to other authors) legions of demons under his command. Valac is said to give true answers about hidden treasures; he reveals where serpents can be seen, and delivers them harmless to the magician. He is said to appear as a small poor boy with angel wings riding on a two-headed dragon.
Other spellings: Ualac, Valak, Valax, Valu, Valic, Volac,yle, mutelanjelo, muteliki.
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He appeard for first time in the movie called The Nun.